The answer is to set the StorageResolution parameter to 1 when calling PutMetricData. This instructs CloudWatch to store the metric at a high resolution of one second rather than the default standard resolution of 60 seconds, which directly reduces the ingestion and retrieval latency that was causing the five-minute delay. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of CloudWatch high-resolution custom metrics with StorageResolution=1, a key concept for real-time monitoring of critical workloads like ECS Fargate tasks. A common trap is assuming the CloudWatch agent is required for custom API calls, but PutMetricData works independently, and simply increasing the call frequency risks throttling without addressing the underlying storage resolution. Remember the mnemonic: "One second, one StorageResolution" — if you need faster custom metrics, set the resolution to 1.
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is running a critical application on Amazon ECS with Fargate. The application generates custom metrics that are published to CloudWatch using the PutMetricData API. Recently, the metrics have been delayed by up to 5 minutes. The DevOps team needs to reduce the latency. What should the team do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the StorageResolution parameter to 1 when calling PutMetricData.
Option D is correct because the storage resolution parameter allows metrics to be stored at a higher resolution (1 second) which can be retrieved faster. Option A is wrong because the CloudWatch agent is not needed for custom API calls. Option B is wrong because increasing the PutMetricData frequency may cause throttling. Option C is wrong because CloudWatch Logs does not replace custom metrics.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Install the CloudWatch agent on the Fargate tasks to collect metrics.
Why it's wrong here
Fargate does not support installing agents directly.
✓
Set the StorageResolution parameter to 1 when calling PutMetricData.
Why this is correct
High-resolution metrics are available faster than standard resolution.
Related concept
Read the scenario before looking for a memorised answer.
✗
Publish the metrics as structured logs to CloudWatch Logs and use metric filters.
Increase the frequency of PutMetricData calls to every 5 seconds.
Why it's wrong here
This may cause throttling and does not guarantee lower latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the StorageResolution parameter to 1 when calling PutMetricData. — Option D is correct because the storage resolution parameter allows metrics to be stored at a higher resolution (1 second) which can be retrieved faster. Option A is wrong because the CloudWatch agent is not needed for custom API calls. Option B is wrong because increasing the PutMetricData frequency may cause throttling. Option C is wrong because CloudWatch Logs does not replace custom metrics.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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